Safety heating device



Aug. 5, 1930. M. BIRKIGT I SAFETY HEATING DEVICE Filed Sept. 19, 1927 2 Sheets-Sheet 1 Aug. 5,1930. M. BIRKIGT 1,772,384

SAFETY HEATING'DEVICE Filed Sept. 19. 1927 2 Sheets-Sheet 2 Patented Aug. 5, 1930 MARC BIRKIGT, OF BOIS-GOLQMBE S, FRANCE SAFETY HEATING nnvicn Application filed September 19, 1927, Serial No. 220,558, and in Belgium June 23, 1927.

so that, in the event of its breakage, there 1 10 is no danger of igniting the explosive Vapors in the vicinity of the carburetor 1 Another object is to provide means for.

cooling the exhaust gases before their passageinto the jacketed carburetor or similar heat exchange device so that their temperature is insufficient to ignite any explosive mixture with which they may accidentally come into contact.

Further objects will appearin the course of the detailed description which will now be given with reference to the accompanying drawings, in which:

Fig. 1 is a partial vertical section through an internal combustion engine fitted with one form of a safety device constructed in accordance withthe invention; i

Fig. 2 is an elevation of the assembly represented in Fig. 1; a

Fig. '3is a section taken online 2-2 of Fig. 1; and

Fig.4 is a section similar to Fig. 3 of a second form of safetydevice.

Referring to the variousfigures of the drawing, thereis shown a cylinder block, which may be of any convenient design, fitted with an exhaust conduit 9. A by-pass collar a is interposed between the cylinder block and conduit 9, and communicates with an ex pansion chamber 6 of suflicient size to cool the exhaust gases passing therethrough to a suflicientlylow temperature to prevent ignition of an explosive mixture. The partially cooled exhaust gases then pass through a conduit 0 leading to a heating packet el en closing the wholeor part ofia carburetor'e.

Chamber 6 may. be conveniently'formed of an annular ofiset' f integral with exhaust conduit 9 and embracing by-pass collar a,

and may be held in position by any convenient form of block h. 7

Communication between chamber 5 and the inside of the exhaust conduit is established by means of a plurality of perforations passing through collar a and grouped together, preferably, diametrically opposite outlet 2' leading to conduit 0. These perforations serve not only as a means of communication but also function similirly to the wiregauze in a Davy safety-lamp to prevent the passage of flames from the inside of the exhaust conduit to chamber 6.

When annular wall f is to be connected to block it by means of bolts, spacing tubes may be arranged inside chamber 6 to prevent bucliiling of walls 7 when the bolts are tightene If desired, collar a'may-be reinforced by. aring j provided with perforations a serving to more thoroughly insure against danger of explosion.

joint uniting it withcylinder In the event of the rupture of tube 0 from any cause, the gases traversing the perforations of collar a will be prevented (1) by the Davy effect of the latter and (2) by the cooling effectof expansion chamber 72 from igniting explosive Vapors in the vicinity of the motor and, more particularly, those surrounding carburetor e. 4

What I claim is I v 1. In an internal combustion engine, a safety heating system comprising a cylin drical exhaust conduit having a plurality of perforations grouped on part of a circumference thereof, an expansion chamber enclosing that part of the cylindrical. exhaust conduit having perforations therethrou'gh, a conduit. communicating with said expansion chamber at a point removed from' saidperforations, andjacketed fuel supply means connected to said last named conduit.

' 2. In an internal combustion engine, acylinder block, ,a jacketed carbureter, an ex-; haust conduit having a by-pass orifice formed therein adapted to conduct part of the ex 'haust gases toward said jacketed carbureter, a by-pass conduit extending from the jacketed carbureter to a point adjacent said bypass orifice, and an expansion chamber interposed between said by-pass orifice and the entrance to said by-pass conduit, said expan- S1011 chamber being dlmensloned so as to cool the by-passed exhaust gases to a temperature below the ignition temperature of the fuel va ors in the vicinity of the cylinder block PIIOI to their entrance into the by-pass eonduit, whereby, in case of rupture of the latter, fire is prevented. In testimony whereof I have hereunto set myhand. u

' LIARC BIRKIGT. 

